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1985 Honda CB450SC Nighthawk Exhaust Gasket Reference Matching

Keep your 1985 CB450SC Nighthawk gasket order precise by retaining the complete Honda number. An older port reference may appear on both quantity choices, while headpipe-joint and crossover numbers identify separate applications. Resolve the reference and supplied count before treating similar-looking products as alternatives.

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Honda CB900 CB650 CB550 exhaust headpipe gasket (each) 18212-634-000

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18212-634-000

$3.58 USD
17-2813
Replace one exhaust port gasket on your CB650, CB400, CB450, or modern CB900F with this Exhaust Port Gasket, 1 piece, replacing OEM #18212-634-000 /...
Honda CB900 CB650 CB550 exhaust headpipe gaskets (pk 10) 18212-634-000

Honda CB Exhaust Headpipe Gaskets ~ (Pk/10) ~ Replaces 18212-634-000

$27.95 USD
17-3813
Stock up on exhaust port gaskets for your CB650, CB400, CB450, or modern CB900F with this 10-pack, replacing OEM #18212-634-000 / #18291-236-000 / #18291-MN4-920.Key...
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Honda CB450 CB400 exhaust joint gasket for headpipe 18391-413-000

1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000

$10.73 USD
17-4504
Replace your CB400 or CB450 exhaust joint gasket with this Exhaust Joint Gasket for Headpipe, replacing OEM #18391-413-000 / #18391-413-010.Key Features• Exhaust joint gasket...
Honda CB750 CB650 CB550 CB450 exhaust crossover gasket 18392-413-000

Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000

$9.95 USD
17-4505
Replace your Nighthawk or CB400/CB450 exhaust crossover gasket with this Exhaust Crossover Gasket, replacing OEM #18392-413-000 / #18392-MG7-750. Fits the mid-'80s CB750SC/CB650SC/CB550SC Nighthawks plus...
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1985 Honda CB450SC Nighthawk · Gaskets & Mounting Hardware Buying guide

Keep the full reference with the required quantity

The port family lists 18212-634-000, 18291-236-000 and 18291-MN4-920 on both package formats. The headpipe joint instead uses 18391-413-000/010, and the crossover uses 18392-413-000 or 18392-MG7-750. These references organize the order by actual sealing location.

Parts to consider

Honda CB Exhaust Headpipe Gaskets ~ (Pk/10) ~ Replaces 18212-634-000 Ten-port-gasket purchasing optionA pack of ten port gaskets referencing 18212-634-000, 18291-236-000 and 18291-MN4-920. Use the package quantity to plan a repair order and deliberate spares.View part Honda CB Exhaust Crossover Gasket ~ Replaces 18392-413-000 Crossover gasket identificationHonda replacement references 18392-413-000 and 18392-MG7-750 identify the crossover application. Retain the full number when comparing it with the required exhaust connection.View part 1978-86 Honda CB450 / CB400 Exhaust Joint Gasket for Headpipe ~ Replaces 18391-413-000 Headpipe-joint gasket identificationReferences 18391-413-000 and 18391-413-010 identify the headpipe-joint application. Dimensions and supplied quantity need confirmation if they affect your order.View part

Related parts: Buy the matching port gasket individually

Use shared port references to compare quantity formats

Both port products identify the same three Honda replacement numbers. Once the port application is matched, choose whether the order needs individually purchased gaskets or a ten-piece pack. Keep the port location on the parts list so a larger package is not confused with supplies for the other exhaust connections.

Complete the information for a multi-joint purchase

List each joint that needs a gasket and keep its reference alongside the connection. The headpipe-joint and crossover products do not state a supplied quantity or dimensions. Confirm those missing details when buying several pieces, and compare changed pipework with its own seal requirements before completing the order.

Exhaust Gasket Reference Matching questions

Can an older 18291-236-000 reference identify either port-gasket package?

Yes. Both the individual port gasket and ten-pack list 18291-236-000 together with 18212-634-000 and 18291-MN4-920. After checking the port application, choose the supplied quantity appropriate to the repair and any spares being ordered.

How should I keep 18391-413-010 and 18392-MG7-750 separate on the order?

Keep 18391-413-010 with the headpipe-joint replacement and 18392-MG7-750 with the crossover replacement. Their additional references are 18391-413-000 and 18392-413-000 respectively. Use the full number and actual location when confirming the required gasket.

What information is needed before ordering several pipe-joint gaskets?

Count the actual connections being serviced, then confirm how many gaskets each purchased item supplies. Obtain any dimensions needed for the fitted pipework. Neither the headpipe-joint nor crossover description states a package quantity or measurements to complete that calculation.

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